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b in (-oo:+oo)
(5/7)*b+1 = 17/7 // - 17/7
(5/7)*b-(17/7)+1 = 0
(5/7)*b-17/7+1 = 0
5/7*b-10/7 = 0 // + 10/7
5/7*b = 10/7 // : 5/7
b = 10/7/5/7
b = 2
b = 2
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